NOTIZEN. Darstellung und Struktur von Ba₆Sn₂P₆ / Preparation and Crystal Structure of Ba₆Sn₂P₆

Abstract

<jats:title>Abstract</jats:title><jats:p> The new compound Ba<jats:sub>6</jats:sub>Sn<jats:sub>2</jats:sub>P<jats:sub>6</jats:sub> crystallizes in the monoclinic system, space group P2<jats:sub>1</jats:sub>/c with lattice constants</jats:p><jats:p> a = 883.7 ± 0.5 pm </jats:p><jats:p>b = 1268.8 ± 0.8 pm</jats:p><jats:p>c= 862.3 ± 0.5 pm </jats:p><jats:p>β = 114.42 ± 0.10°. </jats:p><jats:p>The compound is isotypic to K<jats:sub>6</jats:sub>Sn<jats:sub>2</jats:sub>Te<jats:sub>6</jats:sub> and contains the Sn<jats:sub>2</jats:sub>P<jats:sub>6</jats:sub><jats:sup>12-</jats:sup> -anions which are isosteric with the Sn<jats:sub>2</jats:sub>Te<jats:sub>6</jats:sub><jats:sup>6-</jats:sup> -units.</jats:p>

Two polymorphs of Ba3Sn2P4: Single crystal and electronic structures

“…The Sn(1) Sn(2) bond distances (2.8067(4)Å for I and 2.7803(2)Å for II) are very similar to the Sn Sn bond lengths reported in the ternary phosphide Sr 3 Sn 2 P 4 (average 2.766(1)Å) [14] and is somewhat shorter than in the isolated [Sn 2 P 6 12− ] unit in the Ba 6 Sn 2 P 6 (2.891(5)Å) [41].…”

New Ternary Zirconium Antimonides, ZrSi0.7Sb1.3, ZrGeSb, and ZrSn0.4Sb1.6: A Family Containing ZrSiS-Type andβ-ZrSb2-Type Compounds

“…When the condition is met, the resulting compound adopts either the PbFCl/ZrSiS structure type (in most cases) or the closely related tetragonal (I4/mmm) UGeTe structure type (31). In the present case, if we accept that most regular Sn-Sn single-bond distances in the solid state lie in the range 2.804-2.891 A > (34)(35)(36), with a few examples of slightly longer distances such as 2.984 A > (37), then it is reasonable that ZrSn Sb prefers not to crystallize in the space group P4/nmm since the Zr-4Sb distances for a hypothetical ZrSiS-type compound ''ZrSnSb'' are expected to be at least 2.96 A > . Thus, ZrSn Sb appears to be at the limit for the formation of the MAB structure type.…”

Polymorphism of Ba2SiP4

“…The structures based on SiP 4 tetrahedra as anionic basic building unit are closely related to oxido‐ and nitridosilicates indicating a large structural variety. The nesosilicates Li 8 SiP 4 , EA 4 SiP 4 ( EA = Ca, Sr, Ba) or Na 4 EA 2 SiP 4 ( EA = Ca, Sr, Eu) are rare examples of isolated highly charged [SiP 4 ] 8– anions. More common are SiP 4 anions with reduced charge density achieved by different condensation degrees leading to chains, layers, or three‐dimensional network motifs.…”